664227828 has 36 divisors (see below), whose sum is σ = 1831659648. Its totient is φ = 201281040.

The previous prime is 664227769. The next prime is 664227857. The reversal of 664227828 is 828722466.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 838276 + ... + 839067.

Almost surely, 2^664227828 is an apocalyptic number.

It is an amenable number.

664227828 is an abundant number, since it is smaller than the sum of its proper divisors (1167431820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664227828 is a wasteful number, since it uses less digits than its factorization.

664227828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1677364 (or 1677359 counting only the distinct ones).

The product of its digits is 516096, while the sum is 45.

The square root of 664227828 is about 25772.6177948613. The cubic root of 664227828 is about 872.5139021821.

The spelling of 664227828 in words is "six hundred sixty-four million, two hundred twenty-seven thousand, eight hundred twenty-eight".